CN112574450A - Preparation method of high-absorptivity resin for sanitary towel - Google Patents
Preparation method of high-absorptivity resin for sanitary towel Download PDFInfo
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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Abstract
The invention discloses a preparation method of high-absorptivity resin for sanitary towels, belonging to the technical field of fine chemical engineering, and the method comprises the following steps: (1) acrylic acid is neutralized to a certain degree, and is polymerized with a cross-linking agent, an initiator, a foam stabilizer and a blood anticoagulant under the condition of ventilation to form colloid; (2) adding fine powder during polymer colloid granulation, and controlling particle size distribution through drying, crushing and screening; (3) and adding auxiliary agents such as a blood anticoagulant, a blood affinity agent and the like during surface treatment of the semi-finished product to obtain a finished product SAP. The high-absorptivity resin prepared by the preparation method of the high-absorptivity resin for the sanitary towel has the characteristics of good blood absorption performance and high absorption speed.
Description
Technical Field
The invention relates to the technical field of fine chemical engineering, in particular to a preparation method of high-absorptivity resin for a sanitary towel.
Background
The Super Absorbent Polymer (SAP) has strong water absorption and retention capacity, can absorb hundreds of times or even thousands of times of water of the self-mass, and is widely applied to the field of sanitary products such as paper diapers, sanitary towels and the like.
The research on the absorption performance of high-absorption resin on pure water and saline water is common, for example, patents CN105061961A and CN104356281A both describe a preparation method of salt-resistant high-absorption resin; CN104974312A provides a preparation method of high-absorptivity resin capable of rapidly absorbing pure water and saline water. Blood has special properties compared to these liquids. The blood components include plasma, red blood cells, white blood cells, platelets and other solids, and have certain viscosity. When blood is used as an absorption target, the absorption capacity and absorption rate of the super absorbent resin are remarkably reduced.
In conclusion, in the process of absorbing blood by the resin in the prior art, after the resin and the super absorbent resin are contacted, solid components in blood cannot enter the super absorbent resin, and are likely to cover the surface of resin particles, so that the subsequent diffusion and absorption of blood to an interface are hindered, and the absorption effect of the resin on blood is poor.
Based on the problems, the invention provides a preparation method of high-absorptivity resin for sanitary towels, and the high-absorptivity resin for the sanitary towels prepared by the method
The invention takes the construction roughness as one direction, weakens the obstruction degree of solid components in the blood to a contact interface, introduces the blood anticoagulant and the blood affinity agent, and obviously improves the absorption speed of the SAP to the blood.
According to the invention, the foam stabilizer and the blood anticoagulant are added in the polymerization section, the colloid with certain roughness and higher blood affinity is formed under the ventilation condition, and the fine powder is added in the granulation section, so that the roughness is further enhanced. The particle size distribution of the particles is controlled in a certain range by screening, and the affinity to blood is further enhanced by using an aliphatic hydrocarbon or carbonate external cross-linking agent during surface treatment. The super absorbent resin prepared by the method has high blood absorption speed and is suitable for the field of sanitary towels.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a preparation method of high-absorptivity resin for a sanitary towel is developed, and the high-absorptivity resin for the sanitary towel has good absorption performance on blood and high absorption speed.
The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a method for preparing a highly absorbent resin for sanitary napkins.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of high-absorptivity resin for sanitary towels comprises the following components in parts by mass:
neutralization reaction of S1
Adding 80-100 parts of acrylic acid, 90-125 parts of water and 60-90 parts of 48% alkali into a reactor, mixing and carrying out neutralization reaction;
s2 polymerization
Adding 0.32-1.025 parts of cross-linking agent, 0.5-1.25 parts of foam stabilizer and 0.2-0.32 part of blood anticoagulant, introducing compressed air from the bottom of the reactor, wherein the inner diameter of an air outlet is 4-6 mm, the air flow is 2.0L/min, after introducing air for 10-15 min, cooling and heating the reaction solution to 80 ℃, and then adding initiator, wherein the using amount of the oxidant is 0.002-0.400% of the mass of acrylic acid, and the using amount of the reducing agent is 0.003-0.060% of the mass of acrylic acid;
s3 crushing and granulating
During granulation, 15-20 parts of SPA fine powder is added for granulation, fine powder of super absorbent resin with the particle size of less than 150 mu m is added in the granulation process, the granulation is carried out, the drying is carried out, the addition amount of the fine powder is 5-60% of the mass of the acrylic acid, and the dried material is crushed and screened to control the mass ratio of the particles with the particle size of 45-300 mu m to be 80%;
s4 surface treatment
Preparing surface treatment liquid, wherein the dosage of the surface treatment liquid is 4.0 percent of the mass part of SAP, the temperature of the surface treatment is 160-180 ℃, and the treatment time is 60-80 min, thus obtaining the finished product SAP.
In the above-mentioned preparation processes of S1 and S2, an alkaline substance is added to an aqueous solution of acrylic acid to neutralize a part of the solution, and then an initiator, a crosslinking agent, a blood anticoagulant, and a foam stabilizer are added thereto, and the reaction solution is subjected to radical polymerization under aeration conditions to form a colloid. The gel obtained by polymerization was granulated by adding fine powder of super absorbent resin (particle size <150 μm) to further improve the roughness.
As a further improvement of the scheme, the alkali in the S1 is any one or more of sodium/potassium hydroxide, sodium/potassium bicarbonate and sodium/potassium carbonate, and the addition amount of the alkali is 70-85 parts.
The base may be added in the form of solid particles or in the form of an aqueous solution thereof.
As a further improvement of the scheme, the initiator in S2 is an oxidant or an oxidant/reductant initiation system, wherein the oxidant is any one or more of sodium sulfate, potassium persulfate, ammonium persulfate, and hydrogen peroxide; the reducing agent is any one or more of sodium bisulfite, ferrous sulfate and ascorbic acid.
As a further improvement of the scheme, in S2, one or more of crosslinking agents such as N, N' -methylenebisacrylamide, polyethylene glycol diacrylate, triallylamine, pentaerythritol triallylether, pentaerythritol triacrylate and pentaerythritol tetraacrylate, wherein the amount of the crosslinking agent is 0.05-2.0% of the mass of acrylic acid.
As a further improvement of the scheme, in S2, the blood anticoagulant is selected from any one or more of oxalate, edetate, citrate and heparin, and the dosage of the blood anticoagulant is 0.05-4.0% of acrylic acid by mass, preferably 0.1-2.0%.
As a further improvement of the scheme, in S2, the foam stabilizer is any one of a polymer thickener, super absorbent resin fine powder with a particle size of less than 150 μm, silicone polyether emulsions, a nonionic surfactant and fatty alcohol/acid, the polymer thickener is any one or more of soluble starch, acacia, agar, gelatin, methylcellulose, sodium carboxymethylcellulose, sodium polyacrylate, polyoxyethylene and polyvinylpyrrolidone, and the amount of the foam stabilizer is 0.05 to 5.0 percent, preferably 0.5 to 4.0 percent of the mass part of water in the reaction solution.
The foam stabilizer is used in combination with aeration conditions, so that the solidification rate of bubbles in liquid can be improved.
As a further improvement of the scheme, in S2, the gas is added from the bottom of the reaction solution, the inner diameter of the outlet of the aeration pipeline is less than 10mm, preferably less than 2mm, wherein, the gas is any one of air and inert gas.
In the preparation method, gas is added from the bottom of the reaction liquid, and the inner diameter of the outlet of the vent pipeline is less than 10mm, preferably less than 2mm, so as to ensure that the size of the bubbles is small enough.
As a further improvement of the scheme, in S3, during surface treatment, a blood anticoagulant and a blood affinity agent are added, and the total addition amount of the anticoagulant is 0.1-4.0% of the SAP by mass.
The anticoagulation mechanism of blood anticoagulants is to remove or inhibit certain coagulation factors in the blood, such as calcium factor (Ca2+), which prevents blood coagulation.
As a further improvement of the scheme, the blood affinity agent is aliphatic hydrocarbon and carbonate, such as one or more of methyl carbonate (CAS 616-38-6), ethyl methyl carbonate (CAS 623-53-0), ethylene carbonate (CAS 96-49-1) and propylene carbonate (CAS 108-32-7), and the dosage of the blood affinity agent is 0.01-1.2% of the mass of the high absorption resin.
As a further improvement of the scheme, the surface treatment temperature is 130-190 ℃, and the treatment time is 30-60 minutes.
Compared with the prior art, the preparation method of the high-absorptivity resin for the sanitary towel provided by the invention has the following beneficial effects: 1) adding alkaline substances into an acrylic acid aqueous solution for neutralizing to a partial degree, adding an initiator, a cross-linking agent, a blood anticoagulant and a foam stabilizer, and carrying out free radical polymerization on reaction liquid under the ventilation condition to form a colloid; 2) the anticoagulation mechanism is to remove or inhibit certain coagulation factors in the blood, such as calcium factor (Ca2+), preventing blood coagulation; 3) the foam stabilizer is used in combination with ventilation conditions to improve the solidification rate of bubbles in liquid; 4) fine powder of super absorbent resin (particle size is less than 150 μm) is added during granulation of gel formed by polymerization to further improve roughness; 5) drying, crushing and screening the granulated colloid to obtain super absorbent resin particles with certain particle size distribution; 6) the preparation method controls the particle size of the particles to be mainly distributed in a 45-300 mu m interval, and the mass ratio of the interval is more than or equal to 50 percent, preferably more than or equal to 90 percent. When the super absorbent resin with the smaller particle diameter is applied to the sanitary towel, the super absorbent resin has no granular and foreign body feeling and is soft and comfortable to touch; 7) the blood affinity agent can improve the affinity of the high-absorptivity resin to blood and simultaneously improve the absorption speed; 8) according to the preparation method of the high-absorptivity resin for the sanitary towel, disclosed by the invention, the foam stabilizer and the ventilation agent are combined, fine powder is added in granulation to construct roughness, and the blood anticoagulant and the blood affinity agent are introduced to control the particle size distribution to be fine; 9) drying, crushing and screening the granulated colloid to obtain super absorbent resin particles with certain particle size distribution; 10) the particle size of the particles is controlled to be mainly distributed in a 45-300 mu m interval, the mass ratio of the interval is more than or equal to 50 percent, preferably more than or equal to 90 percent, and when the super absorbent resin with the smaller particle size is applied to the sanitary towel, the super absorbent resin has no particles and foreign body feeling and is soft and comfortable to touch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described with reference to the following embodiments:
the product performance test method of the examples and the comparative examples is as follows:
(1) saline water absorption rate
The saline absorption Capacity (abbreviated as "FSC") refers to the Free Swelling Capacity of a high-absorbency resin per unit mass in saline over a certain period of time.
Specifically, 0.2000g of high-absorptivity resin is weighed by using a tea bag, and is immersed in 0.9 wt% sodium chloride aqueous solution for 30min to be freely expanded, and thenWater absorption capacity (unit; g/g) after 10min of suspension to remove water. Saline absorption rate ═ mAfter absorbing water-mSample (A)-mBlank space)/mSample (A)。
(2) Centrifugal water retention
The Centrifugal Retention Capacity (CRC) is the water absorption Capacity of a superabsorbent resin after a unit mass of the resin freely swells in saline water for a certain period of time and then water is removed by a Centrifuge.
Specifically, 0.2000g of super absorbent resin was weighed in a tea bag, immersed in a 0.9 wt% aqueous sodium chloride solution for 30min to be freely swollen, and then dehydrated by a centrifuge (centrifugal force: 250g) to obtain a water absorption capacity (unit; g/g). Centrifuge retention rate ═ mAfter centrifugation-mSample (A)-mBlank space)/mSample (A)。
(3) Absorption rate under pressure
The Absorption Under Pressure (AUP) is the water Absorption rate of a high-absorbency resin per unit mass Under a certain Pressure for a certain time.
Specifically, the pressure is 2.06kPa (21 g/cm)20.3psi), 0.9000g of a water-absorbent resin was swollen with a 0.9 wt% aqueous sodium chloride solution for 1 hour, and the water absorption capacity (unit: g/g) was obtained. Absorption rate under pressure (m)After absorbing water-mBefore water absorption)/mSample (A)。
(4) Absorption Rate (0.9% saline)
Absorption Speed (AS) refers to how fast a mass of superabsorbent resin absorbs saline water.
Specifically, 50mL of 0.9 wt% sodium chloride aqueous solution is added into a 100mL beaker, 2.0000g of high-absorptivity resin is added into the beaker under magnetic stirring (rotating speed of 600r/min), timing is started, the timing is stopped after the liquid level vortex disappears to the recovery level, and the recorded time is the absorption speed (unit: s).
(5) Absorption Rate (Standard synthetic fluid)
The standard synthetic liquid preparation method refers to national standard GB/T22875-2018 high-absorptivity resin for paper diapers and sanitary towels.
Specifically, 1.0g of a sample to be measured is weighed by an electronic balance to be accurate to 0.001g, and then poured into a 100mL beaker. Shaking the beaker to disperse the sample evenly at the bottom of the beaker. 5mL of the standard synthetic test solution at 23 ℃ is measured by a measuring cylinder, poured into a beaker containing the sample, and timing is started at the same time. The liquid fluidity in the beaker disappeared when the beaker was slightly tilted, and the time taken was recorded. The absorption rate was measured with a stopwatch, and the measurement was performed twice at the same time. The results are reported as the arithmetic mean of the two measurements and rounded to an integer.
(6) Absorption Rate (sheep blood)
The sheep blood is sterilized defibered sheep blood (Nanjing Maojie Biotech Co., Ltd.)
Specifically, 1.0g of a sample to be measured is weighed by an electronic balance to be accurate to 0.001g, and then poured into a 100mL beaker. Shaking the beaker to disperse the sample evenly at the bottom of the beaker. 5mL of goat blood at 23 ℃ is measured by a measuring cylinder, poured into a beaker containing the sample, and timing is started at the same time. The liquid fluidity in the beaker disappeared when the beaker was slightly tilted, and the time taken was recorded. The absorption rate was measured with a stopwatch, and the measurement was performed twice at the same time. The results are reported as the arithmetic mean of the two measurements and rounded to an integer.
Example 1
Adding 100.00 parts of fine acrylic acid, 125.00 parts of water and 86.8 parts of 48% concentration NaHOH into a reactor for neutralization, then adding 1.025 parts of cross-linking agent polyethylene glycol 400 diacrylate, 1.25 parts of foam stabilizer sodium carboxymethyl cellulose and 0.2 part of anticoagulant sodium oxalate, introducing compressed air from the bottom of the reactor, cooling and raising the temperature of a reaction solution to 80 ℃ after 10min, and adding an initiator: 0.8 part of 50 weight percent sodium persulfate. After the polymerization reaction, crushing and granulating are carried out, and 15 parts of SAP fine powder is added during granulation. And (3) drying after granulation, and crushing and screening the dried material to control the mass ratio of the particle size of 45-300 mu m to 80%. And then carrying out surface treatment, wherein the surface treatment liquid is prepared from ethylene glycol diglycidyl ether, methyl carbonate as a blood affinity agent and water according to the proportion of 10:30:60, the using amount of the surface treatment liquid is 4.0 percent of the mass of the SAP, the surface treatment temperature is 180 ℃, and the treatment time is 60min, so as to obtain the finished product SAP.
Example 2
Adding 100.00 parts of fine acrylic acid, 103.00 parts of water and 90.0 parts of 48% NaOH into a reactor for neutralization, then adding 0.815 part of polyethylene glycol 400 diacrylate as a cross-linking agent, 0.320 part of polyethylene glycol 1000 diacrylate, 0.5 part of foam stabilizer SAP fine powder and 0.32 part of anticoagulant disodium ethylene diamine tetraacetate, introducing nitrogen from the bottom of the reactor, leading the inner diameter of an air outlet to be 2mm, leading the flow to be 2.0L/min, cooling and heating the reaction liquid to 80 ℃ after 15min, and adding an initiator: 0.4 part of 50 weight percent sodium persulfate. After the polymerization reaction, crushing and granulating are carried out, and 20 parts of SAP fine powder is added during granulation. And (3) drying after granulation, and crushing and screening the dried material to control the mass ratio of the particle diameter of 45-300 mu m to 83%. And then carrying out surface treatment, wherein the surface treatment liquid is prepared from butanediol, propylene carbonate serving as a blood affinity agent and water according to a ratio of 10:30:60, the using amount of the surface treatment liquid is 4.2% of the mass of the SAP, the surface treatment temperature is 180 ℃, and the treatment time is 60min, so that the finished product SAP is obtained.
Example 3
Adding 100.00 parts of fine acrylic acid and 90.00 parts of fine acrylic acid into a reactor, adding 86.8 parts of 48% NaOH for neutralization, then adding 1.025 parts of cross-linking agent polyethylene glycol 400 diacrylate, 1.1 parts of foam stabilizer SAP fine powder and 0.31 part of anticoagulant sodium oxalate, introducing compressed air from the bottom of the reactor, leading the inner diameter of an air outlet to be 2mm, leading the flow to be 2.0L/min, cooling and heating reaction liquid to 80 ℃ after 10min, and adding an initiator: 0.4 part of 50 weight percent sodium persulfate. After the polymerization reaction, crushing and granulating are carried out, and 15 parts of SAP fine powder is added during granulation. And (3) drying after granulation, and crushing and screening the dried material to control the mass ratio of the particle diameter of 45-300 mu m to 90%. And then carrying out surface treatment, wherein the surface treatment liquid is prepared from ethylene glycol diglycidyl ether, blood affinity agent ethylene carbonate, blood affinity agent ethylene diamine tetraacetic acid disodium and water according to the proportion of 15:40:20:25, the using amount of the surface treatment liquid is 4.5% of the mass of the SAP, the surface treatment temperature is 180 ℃, and the treatment time is 60min, so that the finished product SAP is obtained.
Comparative example 1
100.00 parts of purified acrylic acid and 103.00 parts of water are added into a reactor, 90.0 parts of 48% NaOH is added for neutralization, and 1.30 parts of polyethylene glycol 400 diacrylate serving as a crosslinking agent is added. After mixing evenly, cooling and heating the reaction liquid to 80 ℃, adding an initiator: 0.4 part of 50 weight percent sodium persulfate. After the polymerization reaction is finished, crushing, granulating and drying are carried out, and the dried material is crushed and screened to control the mass ratio of the particle diameter of 45-300 mu m to 50%. And then carrying out surface treatment, wherein the surface treatment liquid is prepared from butanediol, ethylene glycol diglycidyl ether and water according to the proportion of 10:30:60, the using amount of the surface treatment liquid is 4.0 percent of the mass of the SAP, the surface treatment temperature is 180 ℃, and the treatment time is 60min, so that the finished product SAP is obtained.
Table 1: product property tables of examples and comparative examples
Note: 1. the standard synthetic liquid preparation method refers to national standard GB/T22875-
2. The sheep blood is sterilized defibered sheep blood (Nanjing Maojie Biotech Co., Ltd.)
Compared with the prior art, the preparation method of the high-absorptivity resin for the sanitary towel provided by the invention has the following beneficial effects: 1) adding alkaline substances into an acrylic acid aqueous solution for neutralizing to a partial degree, adding an initiator, a cross-linking agent, a blood anticoagulant and a foam stabilizer, and carrying out free radical polymerization on reaction liquid under the ventilation condition to form a colloid; 2) the anticoagulation mechanism is to remove or inhibit certain coagulation factors in the blood, such as calcium factor (Ca2+), preventing blood coagulation; 3) the foam stabilizer is used in combination with ventilation conditions to improve the solidification rate of bubbles in liquid; 4) fine powder of super absorbent resin (particle size is less than 150 μm) is added during granulation of gel formed by polymerization to further improve roughness; 5) drying, crushing and screening the granulated colloid to obtain super absorbent resin particles with certain particle size distribution; 6) the preparation method controls the particle size of the particles to be mainly distributed in a 45-300 mu m interval, and the mass ratio of the interval is more than or equal to 50 percent, preferably more than or equal to 90 percent. When the super absorbent resin with the smaller particle diameter is applied to the sanitary towel, the super absorbent resin has no granular and foreign body feeling and is soft and comfortable to touch; 7) the blood affinity agent can improve the affinity of the high-absorptivity resin to blood and simultaneously improve the absorption speed; 8) according to the preparation method of the high-absorptivity resin for the sanitary towel, disclosed by the invention, the foam stabilizer and the ventilation agent are combined, fine powder is added in granulation to construct roughness, and the blood anticoagulant and the blood affinity agent are introduced to control the particle size distribution to be fine; 9) drying, crushing and screening the granulated colloid to obtain super absorbent resin particles with certain particle size distribution; 10) the particle size of the particles is controlled to be mainly distributed in a 45-300 mu m interval, the mass ratio of the interval is more than or equal to 50 percent, preferably more than or equal to 90 percent, and when the super absorbent resin with the smaller particle size is applied to the sanitary towel, the super absorbent resin has no particles and foreign body feeling and is soft and comfortable to touch.
The above description is only for the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention are within the scope of the present invention.
Claims (10)
1. A preparation method of high-absorptivity resin for sanitary towels is characterized by comprising the following components in parts by mass:
neutralization reaction of S1
Adding 80-100 parts of acrylic acid, 90-125 parts of water and 60-90 parts of 48% alkali into a reactor, mixing and carrying out neutralization reaction;
s2 polymerization
Adding 0.32-1.025 parts of cross-linking agent, 0.5-1.25 parts of foam stabilizer and 0.2-0.32 part of blood anticoagulant, introducing compressed air from the bottom of the reactor, wherein the inner diameter of an air outlet is 4-6 mm, the air flow is 2.0L/min, after introducing air for 10-15 min, cooling and heating the reaction solution to 80 ℃, and then adding initiator, wherein the using amount of the oxidant is 0.002-0.400% of the mass of acrylic acid, and the using amount of the reducing agent is 0.003-0.060% of the mass of acrylic acid;
s3 crushing and granulating
During granulation, 15-20 parts of SPA fine powder is added for granulation, fine powder of super absorbent resin with the particle size of less than 150 mu m is added in the granulation process, the granulation is carried out, the drying is carried out, the addition amount of the fine powder is 5-60% of the mass of the acrylic acid, and the dried material is crushed and screened to control the mass ratio of the particles with the particle size of 45-300 mu m to be 80%;
s4 surface treatment
Preparing surface treatment liquid, wherein the dosage of the surface treatment liquid is 4.0 percent of the mass part of SAP, the temperature of the surface treatment is 160-180 ℃, and the treatment time is 60-80 min, thus obtaining the finished product SAP.
2. The method for preparing a highly absorbent resin for sanitary napkins according to claim 1, wherein the alkali in S1 is one or more of sodium/potassium hydroxide, sodium/potassium bicarbonate, and sodium/potassium carbonate, and the amount of alkali added is 70 to 85 parts.
3. The method for preparing high absorbent resin for sanitary napkins according to claim 1, wherein the initiator in S2 is an oxidant or an oxidant/reductant initiation system, wherein the oxidant is any one or more of sodium sulfate, potassium persulfate, ammonium persulfate, and hydrogen peroxide; the reducing agent is any one or more of sodium bisulfite, ferrous sulfate and ascorbic acid.
4. The method for preparing a high absorbent resin for sanitary napkins according to claim 1, wherein the cross-linking agent of S2 is any one or more of N, N' -methylenebisacrylamide, polyethylene glycol diacrylate, triallylamine, pentaerythritol triallylether, pentaerythritol triacrylate, and pentaerythritol tetraacrylate, wherein the amount of the cross-linking agent is 0.05 to 2.0% by mass of the acrylic acid.
5. The method for preparing a super absorbent resin for sanitary napkins according to claim 1, wherein said blood anticoagulant at S2 is selected from any one or more of oxalate, edetate, citrate and heparin, and the amount of said blood anticoagulant is 0.05-4.0%, preferably 0.1-2.0% by mass of acrylic acid.
6. The method for preparing a high absorbent resin for sanitary napkins according to claim 1, wherein the foam stabilizer in S2 is any one of a polymeric thickener, a fine powder of a super absorbent resin having a particle size of less than 150 μm, a silicone polyether emulsion, a nonionic surfactant, and a fatty alcohol/acid, the polymeric thickener is any one or more of soluble starch, gum arabic, agar, gelatin, methyl cellulose, sodium carboxymethyl cellulose, sodium polyacrylate, polyoxyethylene, and polyvinylpyrrolidone, and the amount of the foam stabilizer is 0.05 to 5.0% by mass, preferably 0.5 to 4.0% by mass of the water in the reaction solution.
7. The method for preparing high absorbent resin for sanitary napkin according to claim 1, wherein the gas in S2 is added from the bottom of the reaction solution, and the inner diameter of the outlet of the aeration pipe is <10mm, preferably <2mm, wherein the gas is any one of air and inert gas.
8. The method for preparing a superabsorbent resin for sanitary napkins according to claim 1, wherein in S3, a blood anticoagulant and a blood affinity agent are added during surface treatment, and the total amount of anticoagulant added is 0.1% to 4.0% of the mass of SAP.
9. The method for preparing a superabsorbent resin for sanitary napkins according to claim 1, wherein the blood affinity agent is any one or more of aliphatic hydrocarbons, carbonates such as methyl carbonate (CAS 616-38-6), ethyl methyl carbonate (CAS 623-53-0), ethylene carbonate (CAS 96-49-1), and propylene carbonate (CAS 108-32-7), and the amount of the blood affinity agent is 0.01% to 1.2% by mass of the superabsorbent resin.
10. The method for preparing a superabsorbent resin for sanitary napkins according to claim 1, wherein the surface treatment temperature is 130 ℃ to 190 ℃ and the treatment time is 30 to 60 minutes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113545917A (en) * | 2021-07-23 | 2021-10-26 | 诺宸股份有限公司 | Bacteriostatic quick-absorption article and manufacturing method thereof |
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| CN109415516A (en) * | 2017-02-10 | 2019-03-01 | 株式会社Lg化学 | Super absorbent polymer and preparation method thereof |
| CN111116817A (en) * | 2019-12-14 | 2020-05-08 | 浙江卫星新材料科技有限公司 | Preparation method of high-absorptivity resin with low residual monomer |
| KR20200073751A (en) * | 2018-12-14 | 2020-06-24 | 주식회사 엘지화학 | Method for preparing antibacterial super absorbent polymer |
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| CN109415516A (en) * | 2017-02-10 | 2019-03-01 | 株式会社Lg化学 | Super absorbent polymer and preparation method thereof |
| KR20200073751A (en) * | 2018-12-14 | 2020-06-24 | 주식회사 엘지화학 | Method for preparing antibacterial super absorbent polymer |
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| CN113545917A (en) * | 2021-07-23 | 2021-10-26 | 诺宸股份有限公司 | Bacteriostatic quick-absorption article and manufacturing method thereof |
| CN113545917B (en) * | 2021-07-23 | 2022-07-05 | 诺宸股份有限公司 | Bacteriostatic quick-absorption article and manufacturing method thereof |
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